scripts/ci/move_docker_to_mnt.sh

#!/usr/bin/env bash
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function cleanup_runner {
    set -x
    echo "Checking free space!"
    df -H
    # Note:
    # Disk layout on x86_64 (2026-01):
    # - root (/) on /dev/sdb1 (75G)
    # - an additional mount as /mnt with 75G on /dev/sda1
    # It seems that arm64 runners have
    # - root (/) on /dev/sda1 (75G)
    # - An un-used nvme with 220G
    # Hence we only move docker to /mnt on x86_64 where we have a separate /mnt mount
    # If we get short on disk space on arm64 as well we need to revisit this logic
    # and make the idle nvme being used as well.
    if uname -i|grep -q x86_64; then
        local target_docker_volume_location="/mnt/var-lib-docker"
        # This is faster than docker prune
        echo "Stopping docker"
        sudo systemctl stop docker
        echo "Checking free space!"
        df -H
        echo "Cleaning docker"
        sudo rm -rf /var/lib/docker
        echo "Checking free space!"
        df -H
        echo "Mounting ${target_docker_volume_location} to /var/lib/docker"
        sudo mkdir -p "${target_docker_volume_location}" /var/lib/docker
        sudo mount --bind "${target_docker_volume_location}" /var/lib/docker
        sudo chown -R 0:0 "${target_docker_volume_location}"
        sudo systemctl start docker
        echo "Checking free space!"
        df -H
    fi
}

cleanup_runner